Hi Ann,
first, disclaimer, I have not worked with Navajo Angora goats.
But while researching about them, these here state that they milk theirs
http://www.dotranchchurros.com/nag.html
If you can go and have taste of the milk there it would be great to check for yourself if you like the taste of the milk, as this is very individual. Furthermore, the taste has also to do with the management.
If you can help this endangered breed while fitting your needs, it would be great!
How big of a herd do you want to have?